HIGH-RESOLUTION MOLECULAR SPECTROSCOPY WITH 2.5 TERAHERTZ QUANTUM CASCADE LASERS

被引：0

作者：

Pavlov, Sergey G. ^{[1
]}

Huebers, Heinz-Wilhelm ^{[1
]}

Greiner-Baer, Michael ^{[1
]}

Richter, Heiko ^{[1
]}

Mahler, Lukas ^{[2
,4
]}

Tredicucci, Alessandro ^{[2
,4
]}

Beere, Harvey E. ^{[3
]}

Ritchie, David A. ^{[3
]}

机构：

[1] German Aerosp Ctr DLR, Inst Planetaty Res, Rutherfordstr 2, D-12489 Berlin, Germany

[2] NEST CNR INFM, I-56126 Pisa, Italy

[3] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[4] Scuola Normale Super Pisa, I-56126 Pisa, Italy

来源：

PROCEEDINGS OF TERA 2008 INTERNATIONAL WORKSHOP THZ RADIATION: BASIC RESEARCH AND APPLICATIONS | 2008年

关键词：

terahertz cascade lasers; molecular spectroscopy;

D O I：

10.1109/TERA.2008.4673828

中图分类号：

TN [电子技术、通信技术];

学科分类号：

0809 ;

摘要：

Quantum cascade lasers operating at about 2.5 terahertz have been implemented in a spectrometer for high resolution molecular spectroscopy. Linewidth, frequency tunability and frequency stability of the lasers were investigated by mixing their radiation with radiation from a 2.5 terahertz gas laser. Two first laser characteristics were found to be sufficient for Doppler-limited spectroscopy. For a demonstration of the spectrometer, absorption at rotational transitions of methanol was measured. The cascade lasers served as radiation source. A gas laser was used to determine the absolute frequency simultaneously with the detection of absorption signal by mixing the gas laser radiation with a part of that from cascade lasers. Amplitude as well as frequency modulation of the output power of the cascade lasers was used. The pressure broadening and the pressure shift of a rotational transition of methanol at 2.519 terahertz were determined.

引用

页码：21 / +

页数：2